抄録
This is the report about the consideration on the stochastic properties of the level fluctuation by the various kinds of the disk played music. The time series of sound levels which are obtained by three sampling methods, are investigated in terms of well fitting probability density functions. Three sampling methods are as follows: a) level sampling at every 0. 1 seconds, b) sampling by equivalent sound levels averaged during every one second, c) level sampling at hearing peaks of loudness. The following results are obtained. 1) The well fitting probability density functions are the Declined-Beta distribution by the linear combination of Beta distribution and the straight line distribution using the suitable parameters. 2) The well fitting transition probability density functions are the joined functions by the Declined-Beta distribution and the binomial distribution using the suitable parameters.
